Git commits in Moodle 3.11.x by Dongsheng Cai

commit ecae6484a4f6343b04b0920f3eaa8b3149f592fa
Author: Dongsheng Cai <d@tux.im>
Date:   Tue, 06 Jul 2021 14:55:21 +0800
Tag:    v3.11.1

MDL-71978 core_calendar: only allow owner to edit user subscriptions

commit e280853f7aea1ae5e7f3d0197fce379ef59a3fe2
Author: Dongsheng Cai <d@tux.im>
Date:   Fri, 28 May 2021 10:34:12 +0800
Tag:    v3.11.1

MDL-70846 accessibility: update color to increase contrast

commit a246699a2ba2a45ef7e2c1e16331224eaa688c72
Author: Dongsheng Cai <d@tux.im>
Date:   Tue, 25 May 2021 18:38:51 +0800
Tag:    v3.11.1

MDL-70846 accessibility: update tree attributes to pass a11y check

commit 5464f370177914dbd1d81f15b7fe4379d1eaf21a
Author: Dongsheng Cai <d@tux.im>
Date:   Tue, 18 May 2021 18:36:49 +0800
Tag:    v3.11.1

MDL-65203 template: tab should be quoted to produce valid json

commit 0ebdf3f1b47c90f6100a33b1c7c9a6d0b14af01d
Author: Dongsheng Cai <d@tux.im>
Date:   Tue, 27 Apr 2021 15:52:01 +0800
Tag:    v3.11.0-beta

MDL-71455 core_backup: fix course completion options when backup/restore

commit 4104a241961c3ca6f89c1ada8ca22b41237e3ccc
Author: Dongsheng Cai <d@tux.im>
Date:   Tue, 20 Apr 2021 18:41:53 +0800
Tag:    v3.11.0-beta

MDL-71235 webservices: add activity completion data to web services

commit f628b3d1bd6ab730b1b31ce985ccb889d6324d06
Author: Dongsheng Cai <d@tux.im>
Date:   Tue, 20 Apr 2021 12:29:22 +0800
Tag:    v3.11.0-beta

MDL-71330 mod_chat: Implement the activity dates functionality

commit 1dbdbb621c3a2bf69231f8c0ab6c8ce208bf0f13
Author: Dongsheng Cai <d@tux.im>
Date:   Wed, 14 Apr 2021 20:44:43 +0800
Tag:    v3.11.0-beta

MDL-68747 mod_quiz: force LTR for quiz grading overview chart

commit 4f1c48ef541578c8efadd7a31813b24d0487c79d
Author: Dongsheng Cai <d@tux.im>
Date:   Thu, 08 Apr 2021 20:38:42 +0800
Tag:    v3.11.0-beta

MDL-69956 forum: throw exception when advanced grading is not ready